I have a Vibe and find it fine to clip to the belt of my jeans but if I clip it to a waist band of leggings or skirt, I find it drags them down unless they are very tight (e.g. lycra running tights).
This does not have to be seen as a bad thing - I think for a six year old you could turn it around to something positive.
Let me explain ... As a vain woman, I hate it when you can see my pump. This is not just seeing the screen and buttons, it is also seeing the bulge from the pump. Unfortunately, there are very very few ways for me to comfortably hide the bulge: a pump belt hides no bumps. I imagine the same is true of a six year old. Except, I hope they are not as vain as me. If I was a kid, I think I would like the opportunity to wear some funky pump belts. You will need more than one so you have a spare when you wash it. Why not get a selection (and maybe make the purchase of more a reward for doing well with the pump) and give your daughter a chance to choose which one to wear each day. Another advantage of this is the belts are better at keeping the tubing out of the way.